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Opened pool yesterday......brought water in to test everything is "PERFEFCT" except I am showing Nitrates again :-( tester said I am at 10 when last year we were over 25 and we drained and refilled and were fine the rest of the summer. I put 5lbs of shock in (per pool guys reccomendation) he...

OK I am new here :) We had a nitrate problem last year and guess it carried over this year. Brought water to be tested and the guy was stunned by the nitrate number. Suggested draining and refilling instead of dumping a ton of $$$ on chemicals. We are almost drained...my question is should I...